423
CXUS56 KSGX 010951
CLMONT

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN DIEGO, CA
251 AM PDT SUN JUN 01 2025

...................................

...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR THE MONTH OF MAY 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            103   05/13/2013
                       05/12/2013
                       05/03/2004
 LOW              42   05/01/1999
HIGHEST          103R  05/10         80      23       83  05/30
LOWEST            53   05/04         53       0       49  05/06
                       05/05
                       05/14
AVG. MAXIMUM    80.9               79.8     1.1     75.4
AVG. MINIMUM    57.7               55.6     2.1     54.4
MEAN            69.3               67.7     1.6     64.9
DAYS MAX >= 90     7                5.0     2.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MAX >= 45    31                                  31
DAYS MAX >= 120    0                                   0
DAYS MIN <= 32     0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        2.52   1977
 MINIMUM        0.00   1983
TOTALS          0.25               0.30   -0.05     0.15
DAILY AVG.      0.01               0.01    0.00     0.00
DAYS >= .01        3                1.7     1.3        2
DAYS >= .10        1                0.9     0.1        1
DAYS >= .50        0                0.0     0.0        0
DAYS >= 1.00       0                0.0     0.0        0
DAYS >= %-5.2F     0                                   0
DAYS >= %-5.2F     0                                   0
GREATEST
 24 HR. TOTAL   0.22   05/04 TO 05/05               0.15  05/04 TO 05/05
 STORM TOTAL    0.19                                0.13
 (MM/DD(HH))            MM


DEGREE DAYS
HEATING TOTAL     32                 37      -5       34
 SINCE 7/1      1134               1288    -154       MM
COOLING TOTAL    174                121      53       36
 SINCE 1/1       250                214      36       MM

FREEZE DATES
RECORD
 EARLIEST     11/30/2004
 LATEST       02/14/2006
EARLIEST                        02/24
LATEST                          02/20
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
RESULTANT WIND SPEED/DIRECTION   6/250
HIGHEST WIND SPEED/DIRECTION    23/270    DATE  05/31
HIGHEST GUST SPEED/DIRECTION    31/260    DATE  05/31

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.47
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      0
HAZE                      8

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$